Simulating a typhoon storm surge using a nested Ecomsed model

Abstract

A nested Ecomsed model with high resolution grid has been developed and used to simulate typical typhoon storm surge (0608 typhoon) which landed on the coast of Zhejiang. Two main pressure modes have been considered in this model: Jelesnianski65 (J65) and Fujita &Takahashi (FJ) model. This study found that FJ model is agree better with the measured values than J65 model. The model has been used to simulate the water level which has been compared with the available field observations (Kanmen; Wenzhou; and Dachen stations). The results show that the error of the peak water level is about 50-70 cm in the first domain and the nested model improves the accuracy which is around 30–50cm(under 30 cm during ebb). The relative error is lower and the time effect is more accurate in the nested small domain. Thus, it is suggested that to simulate and predict typhoon storm surge a nested Ecomsed be adopted.